Proposal for generating and detecting multi-qubit GHZ states in circuit QED

Abstract

We propose methods for the preparation and entanglement detection of multi-qubit GHZ states in circuit quantum electrodynamics. Using quantum trajectory simulations appropriate for the situation of a weak continuous measurement, we show that the joint dispersive readout of several qubits can be utilized for the probabilistic production of high-fidelity GHZ states. When employing a nonlinear filter on the recorded homodyne signal, the selected states are found to exhibit values of the Bell-Mermin operator exceeding 2 under realistic conditions. We discuss the potential of the dispersive readout to demonstrate a violation of the Mermin bound, and present a measurement scheme avoiding the necessity for full detector tomography.

9 pages, 5 figures

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Cited by in corpus (35)

• Microwave photonics with superconducting quantum circuits
• Qubit-oscillator dynamics in the dispersive regime: analytical theory beyond rotating-wave approximation
• Entanglement Metrology Using a Joint Readout of Superconducting Qubits
• Quantum nondemolition detection of a propagating microwave photon
• Generating entanglement between microwave photons and qubits in multiple cavities coupled by a superconducting qutrit
• Dynamics of dispersive single qubit read-out in circuit quantum electrodynamics
• Tunable joint measurements in the dispersive regime of cavity QED
• Many-Body Interactions with Tunable-Coupling Transmon Qubits
• One-step multi-qubit GHZ state generation in a circuit QED system
• Simple preparation of Bell and GHZ states using ultrastrong-coupling circuit QED
• Entangling superconducting qubits in a multi-cavity system
• Generation of Bell and GHZ states from a hybrid qubit-photon-magnon system
• Generating and stabilizing the GHZ state in circuit QED: Joint measurement, Zeno effect and feedback
• Entanglement generation and quantum information transfer between spatially-separated qubits in different cavities
• Preparation of n-qubit Greenberger-Horne-Zeilinger entangled states in cavity QED: An approach with tolerance to nonidentical qubit-cavity coupling constants
• Detecting itinerant single microwave photons
• Greenberger-Horne-Zeilinger generation protocol for N superconducting transmon qubits capacitively coupled to a quantum bus
• Undoing measurement-induced dephasing in circuit QED
• Generation and stabilization of a three-qubit entangled W state in circuit QED via quantum feedback control
• Deterministic generation of arbitrary symmetric states and entanglement classes
• Fast generation of multiparticle entangled state for flux qubits in a circle array of transmission line resonators with tunable coupling
• Reducing quantum control for spin-spin entanglement distribution
• Entanglement detection with trace polynomials
• Transferring arbitrary d-dimensional quantum states of a superconducting qudit in circuit QED
• Greenberger-Horne-Zeilinger state protocols for fully connected qubit networks
• Generating entangled states from coherent states in circuit-QED
• Purification and switching protocols for dissipatively stabilized entangled qubit states
• Quantum Bayesian rule for weak measurements of qubits in superconducting circuit QED
• Parity measurement of remote qubits using dispersive coupling and photodetection
• Maximizing genuine multipartite entanglement of N mixed qubits
• Greenberger-Horne-Zeilinger state generation in qubit-chains via a single $\pi /2$-pulse
• Measurement-induced entanglement of two transmon qubits by a single photon
• Ideal Quantum non-demolishing measurement of a flux qubit at variable bias
• Transferring multiqubit entanglement onto memory qubits in a decoherence-free subspace
• Robustness of the projected squeezed state protocol